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Simplifying 3x2 + 8x = 123 Reorder the terms: 8x + 3x2 = 123 Solving 8x + 3x2 = 123 Solving for variable 'x'. Reorder the terms: -123 + 8x + 3x2 = 123 + -123 Combine like terms: 123 + -123 = 0 -123 + 8x + 3x2 = 0 Begin completing the square. Divide all terms by 3 the coefficient of the squared term: Divide each side by '3'. -41 + 2.666666667x + x2 = 0 Move the constant term to the right: Add '41' to each side of the equation. -41 + 2.666666667x + 41 + x2 = 0 + 41 Reorder the terms: -41 + 41 + 2.666666667x + x2 = 0 + 41 Combine like terms: -41 + 41 = 0 0 + 2.666666667x + x2 = 0 + 41 2.666666667x + x2 = 0 + 41 Combine like terms: 0 + 41 = 41 2.666666667x + x2 = 41 The x term is 2.666666667x. Take half its coefficient (1.333333334). Square it (1.777777780) and add it to both sides. Add '1.777777780' to each side of the equation. 2.666666667x + 1.777777780 + x2 = 41 + 1.777777780 Reorder the terms: 1.777777780 + 2.666666667x + x2 = 41 + 1.777777780 Combine like terms: 41 + 1.777777780 = 42.77777778 1.777777780 + 2.666666667x + x2 = 42.77777778 Factor a perfect square on the left side: (x + 1.333333334)(x + 1.333333334) = 42.77777778 Calculate the square root of the right side: 6.54047229 Break this problem into two subproblems by setting (x + 1.333333334) equal to 6.54047229 and -6.54047229.Subproblem 1
x + 1.333333334 = 6.54047229 Simplifying x + 1.333333334 = 6.54047229 Reorder the terms: 1.333333334 + x = 6.54047229 Solving 1.333333334 + x = 6.54047229 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.333333334' to each side of the equation. 1.333333334 + -1.333333334 + x = 6.54047229 + -1.333333334 Combine like terms: 1.333333334 + -1.333333334 = 0.000000000 0.000000000 + x = 6.54047229 + -1.333333334 x = 6.54047229 + -1.333333334 Combine like terms: 6.54047229 + -1.333333334 = 5.207138956 x = 5.207138956 Simplifying x = 5.207138956Subproblem 2
x + 1.333333334 = -6.54047229 Simplifying x + 1.333333334 = -6.54047229 Reorder the terms: 1.333333334 + x = -6.54047229 Solving 1.333333334 + x = -6.54047229 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.333333334' to each side of the equation. 1.333333334 + -1.333333334 + x = -6.54047229 + -1.333333334 Combine like terms: 1.333333334 + -1.333333334 = 0.000000000 0.000000000 + x = -6.54047229 + -1.333333334 x = -6.54047229 + -1.333333334 Combine like terms: -6.54047229 + -1.333333334 = -7.873805624 x = -7.873805624 Simplifying x = -7.873805624Solution
The solution to the problem is based on the solutions from the subproblems. x = {5.207138956, -7.873805624}
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